Final answer:
For an ECG, the patient is positioned in the supine position, lying on their back with the face-up, to properly place the electrodes on the chest and limbs for accurate heart signal recording. The option (B) is correct.
Step-by-step explanation:
When performing an electrocardiogram (ECG), the patient should be placed in the supine position. This means the patient will be lying on their back, face up. The supine position is used for ECG lead placement, as six electrodes are placed on the chest and four on the limbs for a 12-lead ECG.
This position allows for the accurate recording of the heart's electrical signals and facilitates the placement of electrodes in standard locations on the patient's skin to obtain a detailed picture of heart function. Therefore, option (B) is correct.